Anti-siphon structure for tankless rpessure flushing toilet

ABSTRACT

An anti-siphon structure for a tankless pressure flushing toilet, that comprises: a main body, on which is disposed a water passage channel, the main body is connected to a water output end of a water supply pipe; a movable valve core set, disposed in the main body, to open or close water flowing through the water passage channel; a first check valve, connected to a water output end of the main body, a water output end of the first check valve is connected to a pressure water tank of a toilet seat; and a vacuum breaker, disposed at a side of a front end of the movable valve core set, and is connected to the water passage channel. A second check valve is disposed at the water input end of the main body.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to anti-siphon structure for a flushing toilet, and in particular to an anti-siphon structure for a tankless pressure flushing toilet.

The Prior Arts

In general, a toilet includes a toilet seat and a water tank. In the water tank, an inlet valve is provided to flush the toilet, to prevent water in the water tank from flowing backward to the water supply system to contaminate the drinking water. Usually, on top of the inlet valve is disposed a suction-port type anti-siphon structure, and below the suction port, a CL mark of critical siphon line is disposed, so that the working water level in the water tank must be more than 25 mm from the CL mark. This type of design is suitable for used in an ordinary gravity flushing water tank, but it is not suitable to use for the pressure flushing water tank.

The so-called pressure flushing water tank does not mean to be the pressure flushing valve, rather it refers to a dedicated tight seal water container used to store pressured water. When flushing is required, the flush valve is opened, so that pressured water is released. Then, water is flowed into the water container automatically to restore the original water pressure. For this type of pressure flushing water tank system, the conventional critical-line-mark anti-siphon structure having CL mark can not be used. The reason for this is that, when the tight seal of the check valve for water in the pressure flushing water tank is destroyed or damaged, the water in the pressure flushing water tank is apt to flow backward directly to the water supply system to contaminate the drinking water.

Presently on the market, the pressure flushing water tank system is basically of a high position type water tank design, so that the pressure flushing water tank is located higher than the highest overflow surface of the toilet seat. In this configuration, the combination of a check valve and a vacuum breaker is used, to achieve anti-siphon and prevent water flowing backward. In fact, this type of design is not capable of preventing the pressured water in the pressure flushing water tank from flowing backward to the water supply system. Yet, since the entire pressure flushing water tank is located higher than the flushing toilet, when the flush toilet is blocked, this type of design is able to prevent water from flowing backward to the pressure flushing water tank. Therefore, from the perspective of anti-siphon, the water in the pressure flushing water tank is certainly not dirty water, and the anti-siphon is effective and safe.

In contrast, in the situation that the pressure flushing water tank is located lower than the highest overflow surface of the flushing toilet, the anti-siphon measures mentioned above is rendered ineffective. In this situation, when the flush toilet is blocked, the pressure flushing water tank is not able to prevent dirty water from flowing backward to itself. As such, in this condition, the anti-siphon must be designed by considering water in the pressure flushing water tank is dirty water, and the simple design of using the combination of the check valve and the vacuum breaker to achieve anti-siphon and prevent water from flowing backward is certainly not effective.

Therefore, presently, the design and performance of the flushing toilet is not quite satisfactory, and it leaves much room for improvement.

SUMMARY OF THE INVENTION

In view of the problems and drawbacks of the prior art, the present invention provides an anti-siphon structure for a tankless pressure flushing toilet to redress the shortcomings of the Prior Art.

The objective of the present invention is to provide an anti-siphon structure for a tankless pressure flushing toilet, comprising: a main body, a movable valve core set, a first check valve, and a vacuum breaker. Wherein, the main body is disposed a water passage channel, and the main body is connected to a water output end of a water supply pipe. The movable valve core set is disposed in the main body, to open or close water flowing through the water passage channel. The first check valve is connected to a water output end of the main body, a water output end of the first check valve is connected to a pressure water tank of a toilet. The vacuum breaker is disposed at a side of a front end of the movable valve core set, and is connected to the water passage channel.

In an aspect of the present invention, the movable valve core set includes a mandrel disposed in the main body, one end of the mandrel is disposed a connection ring, a spring is disposed between one end of the connection ring and the main body, and a tight seal ring is disposed on the other end of the connection ring, to open and close water flowing through the water passage channel.

In another aspect of the present invention, an end cover is disposed at one end of the main body located at a water input end of a water input channel. The spring is disposed between the end cover and the connection ring, the tight seal ring is disposed around an outer rim of the connection ring, and a water stop pad is lock tightly to the connection ring through a bolt.

In yet another aspect of the present invention, a water output end of the first check valve is connected to a water passage tube, a water output end of the water passage tube is connected to a pressure water tank, and an open ring and a nut is disposed between a water passage section and the pressure water tank.

In a further aspect of the present invention, a second check valve 90 is disposed at a water input end of the main body 10, to prevent water from flowing backward.

Compared with the existing technology, the present invention has the following advantages:

1. A second check valve is disposed at a water input end of an anti-siphon structure, to prevent water from flowing backward.

2. A vacuum breaker is disposed by a side of the water input end of the anti-siphon structure, to prevent siphon from happening.

3. A first check valve is disposed at a water output end of the anti-siphon structure, to prevent dirty water from flowing backward to the pressure water tank.

4. A movable valve core set is disposed inside the anti-siphon structure, such that even when the tight seal of the second check valve is destroyed or damaged, the movable valve core set is still able to close the water channel, to effectively prevent dirty water from flowing backward to the water supply system.

5. The anti-siphon structure does not have any overflow outlets leading to outside, so that no water will leak out of the flushing toilet, to ensure secure, neat and clean usage.

Further scope of the applicability of the present invention will become apparent from the detailed descriptions given hereinafter. However, it should be understood that the detailed descriptions and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from the detail descriptions.

BRIEF DESCRIPTION OF THE DRAWINGS

The related drawings in connection with the detailed descriptions of the present invention to be made later are described briefly as follows, in which:

FIG. 1 is an exploded view of anti-siphon structure for a tankless pressure flushing toilet according to the present invention;

FIG. 2 is a schematic diagram of anti-siphon structure for a tankless pressure flushing toilet in an application according to the present invention; and

FIG. 3 is a schematic diagram of anti-siphon structure for a tankless pressure flushing toilet in another application according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The purpose, construction, features, functions and advantages of the present invention can be appreciated and understood more thoroughly through the following detailed descriptions with reference to the attached drawings.

Refer to FIGS. 1 to 3 respectively for an exploded view of anti-siphon structure for a tankless pressure flushing toilet according to the present invention; a schematic diagram of anti-siphon structure for a tankless pressure flushing toilet in an application according to the present invention; and a schematic diagram of anti-siphon structure for a tankless pressure flushing toilet in another application according to the present invention.

As shown in FIGS. 1 to 3, the present invention provides an anti-siphon structure for a tankless pressure flushing toilet, comprising: a main body 10, a movable valve core set 20, a first check valve 30, and a vacuum breaker 50. Wherein, the main body 10 is disposed a water passage channel 11, and the main body 10 is connected to a water output end of a water supply pipe. The movable valve core set 20 is disposed in the main body 10, to open or close water flowing through the water passage channel 11. The first check valve 30 is connected to a water output end of the main body 10, a water output end of the first check valve 30 is connected to a pressure water tank of a toilet. The vacuum breaker 50 is disposed at a side of a front end of the movable valve core set 20, and is connected to the water passage channel 11. A second check valve 90 is disposed at a water input end of the main body 10, to prevent water from flowing backward.

The movable valve core set 20 includes a mandrel 21 disposed in the main body 10, one end of the mandrel 21 is disposed a connection ring 22, a spring 23 is disposed between one end of the connection ring 22 and the main body 10. A water stop pad 24 is disposed on the other end of the connection ring 22, to open and close water flowing through the water passage channel 11. In an embodiment of the present invention, an end cover 12 is disposed at one end of the main body 10 located at a water input end of a water input channel. The spring 23 is disposed between the end cover 12 and the connection ring 22, and the tight seal ring 26 is disposed around an outer rim of the connection ring 22, The water stop pad 24 is connected and locked tightly to the connection ring 22 through a bolt 25.

In an embodiment of the present invention, a water output end of the first check valve 30 is connected to a water passage tube 60, a water output end of the water passage tube 60 is connected to a pressure water tank. An open ring 70 and a nut 80 is disposed between a water passage section and the pressure water tank.

Summing up the above, the present invention provides an anti-siphon structure for a tankless pressure flushing toilet, comprising: a main body 10, a movable valve core set 20, a first check valve 30, and a vacuum breaker 50. The first check valve 30 is disposed at a water output end of the anti-siphon structure, and is connected to a water input end of the pressure water tank, to prevent the water in the pressure water tank from flowing backward to the water supply pipe, to cause contamination to the water. The vacuum breaker 50 is disposed at a water input end of the anti-siphon structure, and it can be used to suck in air when negative pressure is produced in the water supply pipe. The movable valve core set 20 is disposed in the anti-siphon structure, and a spring 23 is disposed in the movable valve core set 20. When no water is supplied in the water supply system, the spring 23 pushes the mandrel 21 to move, to make water stop pad 24 to close the water passage channel 11, to prevent water from flowing through, and the flowing backward of dirty water. When water is supplied in the water supply pipe, the water pressure produced is greater than the action force of the spring 23, such that the water stop pad 24 is pushed open by the water pressure, to allow water to flow through the water passage channel 11.

The above detailed description of the preferred embodiment is intended to describe more clearly the characteristics and spirit of the present invention. However, the preferred embodiments disclosed above are not intended to be any restrictions to the scope of the present invention. Conversely, its purpose is to include the various changes and equivalent arrangements which are within the scope of the appended claims. 

What is claimed is:
 1. An anti-siphon structure for a tankless pressure flushing toilet, comprising: a main body, on which is disposed a water passage channel, the main body is connected to a water output end of a water supply pipe; a movable valve core set, disposed in the main body, to open or close water flowing through the water passage channel; a first check valve, connected to a water output end of the main body, a water output end of the first check valve is connected to a pressure water tank of a toilet; and a vacuum breaker, disposed at a side of a front end of the movable valve core set, and is connected to the water passage channel.
 2. The anti-siphon structure for a tankless pressure flushing toilet as claimed in claim 1, wherein the movable valve core set includes a mandrel disposed in the main body, one end of the mandrel is disposed a connection ring, a spring is disposed between one end of the connection ring and the main body, and a tight seal ring is disposed on the other end of the connection ring, to open and close water flowing through the water passage channel.
 3. The anti-siphon structure for a tankless pressure flushing toilet as claimed in claim 2, wherein an end cover is disposed at one end of the main body located at a water input end of a water input channel, the spring is disposed between the end cover and the connection ring, the tight seal ring is disposed around an outer rim of the connection ring, and a water stop pad is lock tightly to the connection ring through a bolt.
 4. The anti-siphon structure for a tankless pressure flushing toilet as claimed in claim 3, wherein a water output end of the first check valve is connected to a water passage tube, a water output end of the water passage tube is connected to a pressure water tank, and an open ring and a nut is disposed between a water passage section and the pressure water tank.
 5. The anti-siphon structure for a tankless pressure flushing toilet as claimed in claim 4, further comprising: a second check valve, disposed at a water input end of the main body to prevent water from flowing backward. 